I’m just ffering this as information to research further. There is a filter on the left of the page, where if you choose DE and EN you finish up with all dictionaries with those languages in them, including Potonnier, which is DE-FR, for example (although I find Potonnier interesting). The Dietl I have on CD is not there – perhaps they are waiting for the new one. I haven’t bothered to work out what the system costs and if it varies according to how many dictionaries you use.

I do use online dictionaries offered to BDÜ members sometimes, mainly for technological terminology.